This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX10, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI40 Standard Cylinder SI40AX10
The AirTAC Airtac SI40 Standard Cylinder SI40AX10 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 10mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX10, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke10 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX10
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI40 Standard Cylinder SI40AX10
The AirTAC SI40AX10 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 10 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX10, a direct sharing the exact interface, bore, stroke, force and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This specific SKU uses an SUS420J2 stainless steel rod (the -A option) but lacks a magnet, meaning it cannot accept position switches.
Airtac SI40 Standard Cylinder SI40AX10 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX10 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX10 |
| Bore size | Ø40 mm |
| Stroke | 10 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40AX10 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40AX10 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40AX10
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×10 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI40 Standard Cylinder SI40AX10 Is Used
Short-Stroke Clamping
Ideal for holding parts in machining fixtures where a 10 mm stroke provides rapid, firm clamping using the 628 N push force.
Ejector Stations
Delivers quick ejection of small components from automated machinery, utilising the 528 N pull force at 0.5 MPa.
Stainless Rod Duty
The SUS420J2 stainless rod option suits environments with moisture or mild corrosion risk where carbon steel is unsuitable.
Replacing the Airtac SI40 Standard Cylinder SI40AX10 with the SAI40AX10
To replace the SI40AX10, order the SAI40AX10. It drops into existing fixtures via the ISO 15552 mounting interface, keeping the 40 mm bore, 10 mm stroke, G1/4 port and M12x1.25 rod thread. Because this SKU lacks a magnet (-S), it cannot support sensors; if position detection is needed, order an SAI40X10S and use current AirTAC switches. If you need more force, the 50 mm bore offers 982 N push at 0.5 MPa; if less is acceptable, the 32 mm bore provides 402 N. For load holding on air loss, note the cushion only decelerates; add an external pilot check valve or choose the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX10
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40AX10 FAQ
Yes, the SI40AX10 is discontinued. The direct replacement is the SAI40AX10. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 10 mm stroke, 628 N force, G1/4 port and mounting interface.
It features a G1/4 air port. At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa push is 879 N, at 0.9 MPa it is 1130 N, and the theoretical maximum force is 128 kgf at 1.0 MPa.
Request a Quote for the SAI40AX10
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX10 replacement — usually within 7-8 hours.